Effect of Surfactant in Particle Shape and Thermal Degradation of Eggshell Particles

Abstract

High energy ball milling and sonofragmentation were used successfully to reduce the crystallite size of calcium carbonate extracted from the eggshell. The ceramic was milled using either deionized water or stearic acid and then subjected to a subsequent size reduction by means of a tip horn. The thermal degradation of particles was influenced by the presence of stearic acid in milling process because it acts as a protective layer around eggshell particles. It was found that the reduction in crystallite size diminishes the degradation temperature and the presence of the surfactant may lead to a change in particle shape by trough a superplasticity phenomenon. Tubes, fibers and a rectangular prism were observed in Transmission Electron Microscopy.

NANOPARTICLE-BASED formulation of dihydroartemisinin-lumefantrine duo-drugs: Preclinical Evaluation and enhanced antimalarial efficacy in a mouse model

“…The FTIR overlay spectra represented the functional groups of compounds in drug excipients and compounds. The wavenumbers exhibited in both empty and duo nano-formulated drug samples were: 3308.29 cm −1 exhibiting the presence of –OH in the structure of polyvinyl alcohol, 2914.88 cm −1 representing strong band, associated with C–H in polyvinyl alcohol [ 44 ] and aliphatic C–H in stearic acid, 2853.17 cm −1 represented aliphatic C–H vibration in stearic acid [ 45 ], 1416.46 cm −1 represented C–O bending peak in stearic acid, 1372.10 cm −1 represented CH 3 symmetrical deformations in chitosan [ 46 ], and absorption peaks exhibited at around 1248.68 cm −1 represented the bending vibration of hydroxyls that exist in chitosan molecules [ 47 ] as reported in other studies. Additionally, more pronounced peaks evidenced in the two free drugs were absent in nano-formulated drugs.…”

As tecnologias e processos de Produção Industrial

“…Por outro lado, o agente de acoplamento e apenas 0,5% de ES aumentaram 800 MPa de módulo de armazenamento do polipropileno. Já os autores Villarreal-Lucio et al (2018b) obtiveram compósitos de polipropileno com partículas e nanopartículas de casca de ovo. A casca de ovo afetou o comportamento de cristalização do PP.…”

Reducing COD Levels of Batik Waste Using Chicken Egg Shells and Tea Dregs

“…The pH level before contact with the biosorbent ranges from 2-4, which is an acidic pH, and the pH after contact with the biosorbent can be said to be close to neutral because it ranges between pH 6-7. Egg shells contain calcium carbonate in about 87% -97% (Lucio et al, 2018). Calcium carbonate is alkaline which can raise the pH of the water.…”